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diff --git a/third_party/eigen3/Eigen/src/Core/util/BlasUtil.h b/third_party/eigen3/Eigen/src/Core/util/BlasUtil.h
deleted file mode 100644
index bbaff8dd0e..0000000000
--- a/third_party/eigen3/Eigen/src/Core/util/BlasUtil.h
+++ /dev/null
@@ -1,237 +0,0 @@
-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra.
-//
-// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-#ifndef EIGEN_BLASUTIL_H
-#define EIGEN_BLASUTIL_H
-
-// This file contains many lightweight helper classes used to
-// implement and control fast level 2 and level 3 BLAS-like routines.
-
-namespace Eigen {
-
-namespace internal {
-
-// forward declarations
-template<typename LhsScalar, typename RhsScalar, typename Index, typename DataMapper, int mr, int nr, bool ConjugateLhs=false, bool ConjugateRhs=false>
-struct gebp_kernel;
-
-template<typename Scalar, typename Index, typename DataMapper, int nr, int StorageOrder, bool Conjugate = false, bool PanelMode=false>
-struct gemm_pack_rhs;
-
-template<typename Scalar, typename Index, typename DataMapper, int Pack1, int Pack2, int StorageOrder, bool Conjugate = false, bool PanelMode = false>
-struct gemm_pack_lhs;
-
-template<
-  typename Index,
-  typename LhsScalar, int LhsStorageOrder, bool ConjugateLhs,
-  typename RhsScalar, int RhsStorageOrder, bool ConjugateRhs,
-  int ResStorageOrder>
-struct general_matrix_matrix_product;
-
-template<typename Index, typename LhsScalar, typename LhsMapper, int LhsStorageOrder, bool ConjugateLhs, typename RhsScalar, typename RhsMapper, bool ConjugateRhs, int Version=Specialized>
-struct general_matrix_vector_product;
-
-
-template<bool Conjugate> struct conj_if;
-
-template<> struct conj_if<true> {
-  template<typename T>
-  inline T operator()(const T& x) { return numext::conj(x); }
-  template<typename T>
-  inline T pconj(const T& x) { return internal::pconj(x); }
-};
-
-template<> struct conj_if<false> {
-  template<typename T>
-  inline const T& operator()(const T& x) { return x; }
-  template<typename T>
-  inline const T& pconj(const T& x) { return x; }
-};
-
-template<typename Scalar> struct conj_helper<Scalar,Scalar,false,false>
-{
-  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Scalar pmadd(const Scalar& x, const Scalar& y, const Scalar& c) const { return internal::pmadd(x,y,c); }
-  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Scalar pmul(const Scalar& x, const Scalar& y) const { return internal::pmul(x,y); }
-};
-
-template<typename RealScalar> struct conj_helper<std::complex<RealScalar>, std::complex<RealScalar>, false,true>
-{
-  typedef std::complex<RealScalar> Scalar;
-  EIGEN_STRONG_INLINE Scalar pmadd(const Scalar& x, const Scalar& y, const Scalar& c) const
-  { return c + pmul(x,y); }
-
-  EIGEN_STRONG_INLINE Scalar pmul(const Scalar& x, const Scalar& y) const
-  { return Scalar(numext::real(x)*numext::real(y) + numext::imag(x)*numext::imag(y), numext::imag(x)*numext::real(y) - numext::real(x)*numext::imag(y)); }
-};
-
-template<typename RealScalar> struct conj_helper<std::complex<RealScalar>, std::complex<RealScalar>, true,false>
-{
-  typedef std::complex<RealScalar> Scalar;
-  EIGEN_STRONG_INLINE Scalar pmadd(const Scalar& x, const Scalar& y, const Scalar& c) const
-  { return c + pmul(x,y); }
-
-  EIGEN_STRONG_INLINE Scalar pmul(const Scalar& x, const Scalar& y) const
-  { return Scalar(numext::real(x)*numext::real(y) + numext::imag(x)*numext::imag(y), numext::real(x)*numext::imag(y) - numext::imag(x)*numext::real(y)); }
-};
-
-template<typename RealScalar> struct conj_helper<std::complex<RealScalar>, std::complex<RealScalar>, true,true>
-{
-  typedef std::complex<RealScalar> Scalar;
-  EIGEN_STRONG_INLINE Scalar pmadd(const Scalar& x, const Scalar& y, const Scalar& c) const
-  { return c + pmul(x,y); }
-
-  EIGEN_STRONG_INLINE Scalar pmul(const Scalar& x, const Scalar& y) const
-  { return Scalar(numext::real(x)*numext::real(y) - numext::imag(x)*numext::imag(y), - numext::real(x)*numext::imag(y) - numext::imag(x)*numext::real(y)); }
-};
-
-template<typename RealScalar,bool Conj> struct conj_helper<std::complex<RealScalar>, RealScalar, Conj,false>
-{
-  typedef std::complex<RealScalar> Scalar;
-  EIGEN_STRONG_INLINE Scalar pmadd(const Scalar& x, const RealScalar& y, const Scalar& c) const
-  { return padd(c, pmul(x,y)); }
-  EIGEN_STRONG_INLINE Scalar pmul(const Scalar& x, const RealScalar& y) const
-  { return conj_if<Conj>()(x)*y; }
-};
-
-template<typename RealScalar,bool Conj> struct conj_helper<RealScalar, std::complex<RealScalar>, false,Conj>
-{
-  typedef std::complex<RealScalar> Scalar;
-  EIGEN_STRONG_INLINE Scalar pmadd(const RealScalar& x, const Scalar& y, const Scalar& c) const
-  { return padd(c, pmul(x,y)); }
-  EIGEN_STRONG_INLINE Scalar pmul(const RealScalar& x, const Scalar& y) const
-  { return x*conj_if<Conj>()(y); }
-};
-
-template<typename From,typename To> struct get_factor {
-  EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE To run(const From& x) { return x; }
-};
-
-template<typename Scalar> struct get_factor<Scalar,typename NumTraits<Scalar>::Real> {
-  EIGEN_DEVICE_FUNC
-  static EIGEN_STRONG_INLINE typename NumTraits<Scalar>::Real run(const Scalar& x) { return numext::real(x); }
-};
-
-
-/* Helper class to analyze the factors of a Product expression.
- * In particular it allows to pop out operator-, scalar multiples,
- * and conjugate */
-template<typename XprType> struct blas_traits
-{
-  typedef typename traits<XprType>::Scalar Scalar;
-  typedef const XprType& ExtractType;
-  typedef XprType _ExtractType;
-  enum {
-    IsComplex = NumTraits<Scalar>::IsComplex,
-    IsTransposed = false,
-    NeedToConjugate = false,
-    HasUsableDirectAccess = (    (int(XprType::Flags)&DirectAccessBit)
-                              && (   bool(XprType::IsVectorAtCompileTime)
-                                  || int(inner_stride_at_compile_time<XprType>::ret) == 1)
-                             ) ?  1 : 0
-  };
-  typedef typename conditional<bool(HasUsableDirectAccess),
-    ExtractType,
-    typename _ExtractType::PlainObject
-    >::type DirectLinearAccessType;
-  static inline ExtractType extract(const XprType& x) { return x; }
-  static inline const Scalar extractScalarFactor(const XprType&) { return Scalar(1); }
-};
-
-// pop conjugate
-template<typename Scalar, typename NestedXpr>
-struct blas_traits<CwiseUnaryOp<scalar_conjugate_op<Scalar>, NestedXpr> >
- : blas_traits<NestedXpr>
-{
-  typedef blas_traits<NestedXpr> Base;
-  typedef CwiseUnaryOp<scalar_conjugate_op<Scalar>, NestedXpr> XprType;
-  typedef typename Base::ExtractType ExtractType;
-
-  enum {
-    IsComplex = NumTraits<Scalar>::IsComplex,
-    NeedToConjugate = Base::NeedToConjugate ? 0 : IsComplex
-  };
-  static inline ExtractType extract(const XprType& x) { return Base::extract(x.nestedExpression()); }
-  static inline Scalar extractScalarFactor(const XprType& x) { return conj(Base::extractScalarFactor(x.nestedExpression())); }
-};
-
-// pop scalar multiple
-template<typename Scalar, typename NestedXpr>
-struct blas_traits<CwiseUnaryOp<scalar_multiple_op<Scalar>, NestedXpr> >
- : blas_traits<NestedXpr>
-{
-  typedef blas_traits<NestedXpr> Base;
-  typedef CwiseUnaryOp<scalar_multiple_op<Scalar>, NestedXpr> XprType;
-  typedef typename Base::ExtractType ExtractType;
-  static inline ExtractType extract(const XprType& x) { return Base::extract(x.nestedExpression()); }
-  static inline Scalar extractScalarFactor(const XprType& x)
-  { return x.functor().m_other * Base::extractScalarFactor(x.nestedExpression()); }
-};
-
-// pop opposite
-template<typename Scalar, typename NestedXpr>
-struct blas_traits<CwiseUnaryOp<scalar_opposite_op<Scalar>, NestedXpr> >
- : blas_traits<NestedXpr>
-{
-  typedef blas_traits<NestedXpr> Base;
-  typedef CwiseUnaryOp<scalar_opposite_op<Scalar>, NestedXpr> XprType;
-  typedef typename Base::ExtractType ExtractType;
-  static inline ExtractType extract(const XprType& x) { return Base::extract(x.nestedExpression()); }
-  static inline Scalar extractScalarFactor(const XprType& x)
-  { return - Base::extractScalarFactor(x.nestedExpression()); }
-};
-
-// pop/push transpose
-template<typename NestedXpr>
-struct blas_traits<Transpose<NestedXpr> >
- : blas_traits<NestedXpr>
-{
-  typedef typename NestedXpr::Scalar Scalar;
-  typedef blas_traits<NestedXpr> Base;
-  typedef Transpose<NestedXpr> XprType;
-  typedef Transpose<const typename Base::_ExtractType>  ExtractType; // const to get rid of a compile error; anyway blas traits are only used on the RHS
-  typedef Transpose<const typename Base::_ExtractType> _ExtractType;
-  typedef typename conditional<bool(Base::HasUsableDirectAccess),
-    ExtractType,
-    typename ExtractType::PlainObject
-    >::type DirectLinearAccessType;
-  enum {
-    IsTransposed = Base::IsTransposed ? 0 : 1
-  };
-  static inline ExtractType extract(const XprType& x) { return Base::extract(x.nestedExpression()); }
-  static inline Scalar extractScalarFactor(const XprType& x) { return Base::extractScalarFactor(x.nestedExpression()); }
-};
-
-template<typename T>
-struct blas_traits<const T>
-     : blas_traits<T>
-{};
-
-template<typename T, bool HasUsableDirectAccess=blas_traits<T>::HasUsableDirectAccess>
-struct extract_data_selector {
-  static const typename T::Scalar* run(const T& m)
-  {
-    return blas_traits<T>::extract(m).data();
-  }
-};
-
-template<typename T>
-struct extract_data_selector<T,false> {
-  static typename T::Scalar* run(const T&) { return 0; }
-};
-
-template<typename T> const typename T::Scalar* extract_data(const T& m)
-{
-  return extract_data_selector<T>::run(m);
-}
-
-} // end namespace internal
-
-} // end namespace Eigen
-
-#endif // EIGEN_BLASUTIL_H